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<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:maroon'>I am a bit
confused. The initial question sounded like a volume rendering problem;
you could not see the result of the mesh quality filter very well. Is the
problem you are reporting that the output of the mesh quality filter is
incorrect? Do the ranges look wrong in the information tab? Does
the threshold filter not extract cells you expect to be of poor quality?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:maroon'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:maroon'>Does your
modified mesh quality filter behave differently than the one that comes with
ParaView? The pipeline should not be updating your filter unless it needs
to refresh the calculation. The mesh quality filter will be run multiple
times on multiblock data (once per block), but I assume that is not the case
for you as volume rendering is not available on data with more than one block.
The cell count might be off because you are running in parallel. Each
process will have a partition of the whole mesh, so the cell count will be
smaller unless you are getting the global multiprocess controller and adding up
all the cells.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:maroon'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:maroon'>If the pipeline
is inappropriately calling your filter multiple times, it might be that your
filter is calling its own Modified method (usually indirectly through, for
example, a call to one of the Set* macros). You can check for that by
making sure that the MTime ivar does not change while invoking RequestData or
any other ProcessRequests method.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:maroon'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:maroon'>-Ken<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:maroon'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Nathanael Inkson
[mailto:Nathanael.Inkson@digitalflowsolutions.com] <br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, September 02, 2008
11:15 AM<br>
<b><span style='font-weight:bold'>To:</span></b> Moreland, Kenneth<br>
<b><span style='font-weight:bold'>Cc:</span></b> simon.hubbard@digitalflowsolutions.com<br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: Strange behaviour
with large datasets</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Dear Ken,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'> Thanks
for your answer but I am not sure that this is the reason as I have other
fields which have large values. If I count the number of cells in one pass
through vtkMeshQuality and output to a file, I find that the answer is far less
than the actual number of cells in the mesh. I have a gut feeling that because
the mesh is so big that the MeshQuality filter is entered several times as it
updates the progress bar, wouldn’t that mean that the newly created
quality arrays are overwritten each time the filter is entered? I’m not
too sure about how the filters actually work.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>How is this prevented?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Thanks<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'>Nat.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=navy face=Arial><span lang=EN-GB
style='font-size:10.0pt;font-family:Arial;color:navy'><o:p> </o:p></span></font></p>
<div>
<p class=MsoNormal><b><font size=2 color=gray face=Verdana><span
style='font-size:10.0pt;font-family:Verdana;color:gray;font-weight:bold'>Best
Regards<o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color=gray face=Verdana><span
style='font-size:10.0pt;font-family:Verdana;color:gray;font-weight:bold'> <o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color=gray face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:gray;font-weight:bold'>Dr.
Nathanael Inkson,</span></font></b><b><font size=2 color=gray face=Verdana><span
style='font-size:10.0pt;font-family:Verdana;color:gray;font-weight:bold'><o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color=gray face=Verdana><span
style='font-size:10.0pt;font-family:Verdana;color:gray;font-weight:bold'> <o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color=gray face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:gray;font-weight:bold'>Computational
Fluid Dynamics Developer,</span></font></b><b><font size=2 color=gray
face=Verdana><span style='font-size:10.0pt;font-family:Verdana;color:gray;
font-weight:bold'><o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color=gray face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:gray;font-weight:bold'>Digital
Flow Solutions,</span></font></b><b><font size=2 color=gray face=Verdana><span
style='font-size:10.0pt;font-family:Verdana;color:gray;font-weight:bold'><o:p></o:p></span></font></b></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
lang=EN-GB style='font-size:12.0pt;color:navy'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
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src="cid:image002.jpg@01C90CF0.D2911E60" align=baseline border=0><strong><b><font
face=Verdana><span style='font-family:Verdana'><o:p></o:p></span></font></b></strong></span></font></b></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><strong><b><font
size=1 color=gray face=Verdana><span style='font-size:9.0pt;font-family:Verdana;
color:gray'>mob: + 44 7872010167</span></font></b></strong><strong><b><font
size=1 color=gray face=Verdana><span style='font-size:7.5pt;font-family:Verdana;
color:gray'><o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><strong><b><font
size=1 color=gray face=Verdana><span style='font-size:9.0pt;font-family:Verdana;
color:gray'>web: <a href="http://wirthresearch.com">wirthresearch.com</a></span></font></b></strong><font
size=1 color=navy><span lang=EN-GB style='font-size:9.0pt;color:navy'><o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 color=navy face="Times New Roman"><span
lang=EN-GB style='font-size:12.0pt;color:navy'> </span></font><span
lang=EN-GB><o:p></o:p></span></p>
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face="Times New Roman"><span style='font-size:12.0pt'>
<hr size=2 width="100%" align=center tabindex=-1>
</span></font></div>
<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'> Moreland,
Kenneth [mailto:kmorel@sandia.gov] <br>
<b><span style='font-weight:bold'>Sent:</span></b> 02 September 2008 14:58<br>
<b><span style='font-weight:bold'>To:</span></b> Nathanael Inkson; <st1:PersonName
w:st="on">paraview@paraview.org</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> RE: Strange behaviour
with large datasets</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span lang=EN-GB
style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:maroon'>If your mesh is
typical, then probably most of the cells are of good quality, and there are a
handful of cells of bad quality. Thus, when volume rendering most of the
cells will be invisible and that handful of cells will have some opacity.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:maroon'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:maroon'>The probable
reason that you can see them in a small mesh and not a large one is that the
cells are spatially much smaller (with respect to the entire mesh) for the
large mesh. In correct volume rendering, a material of a constant density
will have smaller opacity the thinner it gets. Your cells are probably so
small that there is not enough accumulation to actually see them.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:maroon'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:maroon'>You can adjust
for the small scale of the cells by adjusting the “Scale” parameter
in the Color Scale Editor dialog box. That parameter is actually a unit
length specification for the opacity parameters given. Setting it to about
cell length divided by 10 should give you decent results. However, an
easier and probably more effective approach would be to bag the volume
rendering and use the threshold filter to extract the cells of interest (in
this case, the bad ones).<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:maroon'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:maroon'>-Ken<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 color=maroon face="Courier New"><span
style='font-size:10.0pt;font-family:"Courier New";color:maroon'><o:p> </o:p></span></font></p>
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<p class=MsoNormal><b><font size=2 face=Tahoma><span style='font-size:10.0pt;
font-family:Tahoma;font-weight:bold'>From:</span></font></b><font size=2
face=Tahoma><span style='font-size:10.0pt;font-family:Tahoma'>
paraview-bounces@paraview.org [mailto:paraview-bounces@paraview.org] <b><span
style='font-weight:bold'>On Behalf Of </span></b>Nathanael Inkson<br>
<b><span style='font-weight:bold'>Sent:</span></b> Tuesday, September 02, 2008
7:31 AM<br>
<b><span style='font-weight:bold'>To:</span></b> <st1:PersonName w:st="on">paraview@paraview.org</st1:PersonName><br>
<b><span style='font-weight:bold'>Subject:</span></b> [Paraview] Strange
behaviour with large datasets</span></font><o:p></o:p></p>
</div>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Dear Paraview people,<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>
I am working with Paraview with very large datasets (around 40Gb). I have
written a filter derived from MeshQuality which doesn’t seem to display
the returned data arrays correctly. I checked with the same mesh and the
MeshQuality filter. The same thing happens: I put the output on volume
rendering to look at the quality field and the whole dataset is invisible. I
have tried rescaling the range but to know avail. Is this a known problem?<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'>Any advice? With smaller meshes the problem
disappears and the quality field is visible with volume rendering.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span lang=EN-GB style='font-size:
10.0pt;font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><b><font size=2 color=gray face=Verdana><span
style='font-size:10.0pt;font-family:Verdana;color:gray;font-weight:bold'>Best
Regards<o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color=gray face=Verdana><span
style='font-size:10.0pt;font-family:Verdana;color:gray;font-weight:bold'> <o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color=gray face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:gray;font-weight:bold'>Dr.
Nathanael Inkson,</span></font></b><b><font size=2 color=gray face=Verdana><span
style='font-size:10.0pt;font-family:Verdana;color:gray;font-weight:bold'><o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color=gray face=Verdana><span
style='font-size:10.0pt;font-family:Verdana;color:gray;font-weight:bold'> <o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color=gray face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:gray;font-weight:bold'>Computational
Fluid Dynamics Developer,</span></font></b><b><font size=2 color=gray
face=Verdana><span style='font-size:10.0pt;font-family:Verdana;color:gray;
font-weight:bold'><o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=2 color=gray face=Arial><span
style='font-size:10.0pt;font-family:Arial;color:gray;font-weight:bold'>Digital
Flow Solutions,</span></font></b><b><font size=2 color=gray face=Verdana><span
style='font-size:10.0pt;font-family:Verdana;color:gray;font-weight:bold'><o:p></o:p></span></font></b></p>
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style='font-size:12.0pt'><o:p> </o:p></span></font></p>
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size=1 color=gray face=Verdana><span style='font-size:9.0pt;font-family:Verdana;
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